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Re: Bench bleeding
Posted by: Richard ()
Date: February 03, 2018 09:02PM

I typed SC weather into Google. First response was Columbia,SC , Humidity 50%.
You have moisture in your brake fluid.

I do agree with you about not bench bleeding the MC on a Corvair and many other vehicles.
Bench bleeding only became necessary in the 70's when they started mounting the MC at radical angles that traps large amounts of air in the front of both the primary and secondary chambers.

Any of you that were wrenching back in the 60's and 50's would have laughed at the suggestion.

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Re: Bench bleeding
Posted by: irfgt ()
Date: February 04, 2018 02:58AM

Richard Wrote:
-------------------------------------------------------
> I typed SC weather into Google. First response was
> Columbia,SC , Humidity 50%.
> You have moisture in your brake fluid.
>
> I do agree with you about not bench bleeding the
> MC on a Corvair and many other vehicles.
> Bench bleeding only became necessary in the 70's
> when they started mounting the MC at radical
> angles that traps large amounts of air in the
> front of both the primary and secondary chambers.
>
> Any of you that were wrenching back in the 60's
> and 50's would have laughed at the suggestion.


That picture would be true if you tried to gravity bleed the cylinder and the pistons do not move. Fact is that the line fittings are at the upper end of the cylinder chambers and when the piston moves all the fluid and air is forced out the line fitting.

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Re: Bench bleeding
Posted by: red monza ()
Date: February 04, 2018 08:58AM

My Ol SUPER MECHANIC NEVER had to go into the brakes after putting a new master cylinder on...if memory don't fail me....seems like he told me to crack the lines going into the system at the MC, and have someone slowly apply the brakes and then he would lock down the lines...repeat if necessary....Ken Hand reminds me of my great mechanic ARTHUR...and his way of doing things.

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